Circuit board assembly

ABSTRACT

The disclosure provides a circuit board assembly, which includes a core layer, an electronic component, a first shielding ring wall, a second shielding ring wall, a first circuit layer, a second circuit layer, a first insulating layer and a plurality of shielding columns. The core layer has an accommodating space, in which the accommodating space has an inner sidewall. The electronic component is disposed in the accommodating space. The first shielding ring wall is disposed in the accommodating space and covers the inner sidewall, in which the first shielding ring wall surrounds the electronic component and is not in contact with the electronic component. The second shielding ring wall is disposed in the core layer and surrounds the first shielding ring wall. The core layer is disposed between the first circuit layer and the second circuit layer. The shielding columns are disposed in the first insulating layer.

CROSS-REFERENCE TO RELATED APPLICATION

The present application is a Divisional Application of the U.S.application Ser. No. 17/565,538, filed Dec. 30, 2021, which claimspriority to China Application Serial Number 202111438219.6, filed onNov. 30, 2021, all of which are herein incorporated by reference intheir entireties.

BACKGROUND Field of Invention

This disclosure relates to a circuit board assembly and a manufacturingmethod thereof, in particular to a circuit board assembly and amanufacturing method thereof that can effectively shield electromagneticinterference between electronic components.

Description of Related Art

A current chip package, such as System in a Package (SiP), includes aplurality of electronic components. These electronic components generateelectromagnetic waves when these electronic components are in operation,and the electromagnetic waves interfere with these electroniccomponents, thereby affecting the operation of these electroniccomponents. In this way, an electronic device equipped with this chippackage, such as a smartphone or a tablet, may operate abnormally oreven malfunction. Therefore, reducing or avoiding the interference ofthe electromagnetic waves on the electronic components in the chippackage is an issue worthy of discussion.

SUMMARY

A purpose of the present disclosure is to provide a circuit boardassembly, which includes a core layer, at least one electroniccomponent, at least one first shielding ring wall, at least one secondshielding ring wall, a first circuit layer, a second circuit layer, afirst insulating layer and a plurality of shielding columns. The corelayer has an accommodating space, in which the accommodating space hasan inner sidewall. The electronic component is disposed in theaccommodating space. The first shielding ring wall is disposed in theaccommodating space and covers the inner sidewall, in which the firstshielding ring wall surrounds the electronic component and is not incontact with the electronic component. The second shielding ring wall isdisposed in the core layer and surrounds the first shielding ring wall.The core layer is disposed between the first circuit layer and thesecond circuit layer. The second circuit layer is disposed between thefirst insulating layer and the core layer. The shielding columns aredisposed in the first insulating layer.

In some embodiments, the shielding columns are electrically connected tothe first shielding ring wall.

In some embodiments, the circuit board assembly further includes ashielding layer, in which the shielding layer is disposed beneath thefirst insulating layer, and the first insulating layer is disposedbetween the shielding layer and the core layer, and the shieldingcolumns extend to the core layer and the shielding layer.

In some embodiments, the second shielding ring wall includes two metallayers and a conductive material, and the metal layers are arranged inconcentric rings, and one of the metal layers surrounds the other of themetal layers and the conductive material.

In some embodiments, a surface of the electronic component, one end ofthe conductive material, and a surface of the core layer are coplanar.

In some embodiments, the height of the second shielding ring wall isgreater than the thickness of the at least one electronic component.

In some embodiments, the circuit board assembly further includes asecond insulating layer, in which the first circuit layer is disposedbetween the second insulating layer and the core layer.

In some embodiments, a material of the core layer is a photosensitivedielectric material.

In some embodiments, the circuit board assembly further includes agraphene layer, in which the graphene layer is disposed in theaccommodating space and surrounds the electronic component, and thegraphene layer is continuously distributed around the electroniccomponent.

In some embodiments, the electronic component is electrically isolatedfrom the first shielding ring wall, the second shielding ring wall, andthe shielding columns.

The present disclosure also provides a method of manufacturing a circuitboard assembly, which includes providing a substrate. A first dielectriclayer and a first release film are formed on the substrate, in whichfirst release film is disposed between the first dielectric layer andthe substrate. The first dielectric layer is patterned to form a firstdielectric pattern layer, in which the first dielectric pattern layerhas at least one first recess and at least one first groove. A firstmetal layer is formed on the first dielectric pattern layer, in whichthe first metal layer covers an upper surface of the first dielectricpattern layer, a sidewall of the first recess and a sidewall of thefirst groove. At least one electronic component is disposed in the atleast one first recess, in which the electronic component is disposed onthe substrate. A second dielectric pattern layer is disposed on thefirst dielectric pattern layer and the electronic component afterdisposing the electronic component in the at least one first recess toform a core layer including the first dielectric pattern layer and thesecond dielectric pattern layer. At least one circuit layer is formed onthe core layer. At least one insulating layer is formed on the circuitlayer. A plurality of shielding columns are formed in the insulatinglayer.

In some embodiments, forming the second dielectric pattern layerincludes: while forming the first dielectric layer and the first releasefilm, forming a second dielectric layer and a second release film onanother side of the substrate opposite to the first dielectric layer, inwhich the second release film is disposed between the second dielectriclayer and the substrate. The second dielectric layer is patterned toform the second dielectric pattern layer, in which the second dielectricpattern layer has at least one second recess and at least one secondgroove. A second metal layer is formed on the second dielectric patternlayer, in which the second metal layer covers an upper surface of thesecond dielectric pattern layer, a sidewall of the second recess and asidewall of the second groove.

In some embodiments, the method of manufacturing the circuit boardassembly further includes filling a plurality of conductive materials inthe first groove and the second groove during disposing the electroniccomponent in the at least one first recess, in which the conductivematerials protrude from a surface of the first dielectric pattern layerand a surface of the second dielectric pattern layer.

In some embodiments, the method of manufacturing the circuit boardassembly further includes after respectively forming the first metallayer and the second metal layer on the first dielectric pattern layerand the second electrical pattern layer, and before disposing theelectronic element in the at least one first recess, thinning the firstmetal layer, the second metal layer, the first dielectric pattern layer,and the second dielectric pattern layer to expose an upper surface ofthe first dielectric pattern layer and an upper surface of the seconddielectric pattern layer.

In some embodiments, patterning the first dielectric layer and thesecond dielectric layer comprises an exposure process and a developmentprocess.

In some embodiments, disposing the second dielectric pattern layer onthe first dielectric pattern layer and the electronic component, thesecond dielectric pattern layer and the first dielectric pattern layerare adhered to each other.

In some embodiments, in the step of disposing the second dielectricpattern layer on the first dielectric pattern layer and the electroniccomponent, the substrate, the first dielectric pattern layer, the seconddielectric pattern layer, the electronic component and the conductivematerials are in a working environment with a temperature in a rangefrom 25° C. to 180° C.

In some embodiments, the method of manufacturing the circuit boardassembly further includes removing the substrate after forming theconductive columns in the insulating layer. At least one build-upcircuit layer is formed on the core layer. At least one build-upinsulating layer is formed on the build-up circuit layer.

In some embodiments, portions of the conductive columns are disposed inthe insulating layer along the first metal layer and the second metallayer adjacent to the electronic component.

BRIEF DESCRIPTION OF THE DRAWINGS

Aspects of the present disclosure are best understood from the followingdetailed description when read with the accompanying figures. It isnoted that, in accordance with the standard practice in the industry,various features are not drawn to scale. In fact, the dimensions of thevarious features may be arbitrarily increased or reduced for clarity ofdiscussion.

FIG. 1A is a schematic cross-sectional view of a circuit board

assembly according to some embodiments of the present disclosure.

FIG. 1B is a schematic top view of a core layer, an electroniccomponent, a first shielding ring wall, a second shielding ring wall,and a shielding column according to FIG. 1A.

FIGS. 2A to 2J are schematic cross-sectional views illustrating a methodof manufacturing a circuit board assembly at various process stagesaccording to some embodiments of the present disclosure.

FIG. 3A is a schematic cross-sectional view of a circuit board assemblyaccording to other embodiments of the present disclosure.

FIG. 3B is a schematic top view of a core layer, an electroniccomponent, a first shielding ring wall, a second shielding ring wall, ashielding column, and a graphene layer according to FIG. 3A.

FIGS. 4A to 4D are schematic cross-sectional views illustrating a methodof manufacturing a circuit board assembly at various process stagesaccording to other embodiments of the present disclosure.

FIG. 5A is a schematic cross-sectional view of a circuit board assemblyaccording to still other embodiments of the present disclosure.

FIG. 5B is a schematic top view of a core layer, an electroniccomponent, a first shielding ring wall, a second shielding ring wall,and a shielding column according to FIG. 5A.

FIGS. 6A to 6C are schematic cross-sectional views illustrating a methodof manufacturing a circuit board assembly at various process stagesaccording to still other embodiments of the present disclosure.

FIG. 7 is a schematic cross-sectional view of a circuit board assemblyaccording to still other embodiments of the present disclosure.

DETAILED DESCRIPTION

The following disclosure provides many different embodiments orexamples, for implementing different features of the provided subjectmatter. Specific examples of elements, values, operations, materials,configurations and the like are described below to simplify the presentdisclosure. These are, of course, merely examples and are not intendedto be limiting. Other elements, values, operations, materials,configurations and the like are also considered. For example, in thefollowing description, forming a first feature on a second feature mayinclude an embodiment in which the first and second features are formedin direct contact, and may also include an embodiment in which anadditional feature may be formed between the first and second features,such that the first and second features are not in direct contact. Inaddition, the present disclosure may repeat reference numerals and/orletters in the various examples. This repetition does not indicate arelationship between the various embodiments and/or configurationsdiscussed.

In addition, spatially relative terms, such as “beneath”, “below”,“lower”, “over”, “higher”, etc. may be used herein for ease ofdescription to describe one element or feature's relationship to anotherelement(s) or feature(s) as illustrated in the figures. The spatiallyrelative terms are intended to encompass different orientations of thedevice in use or operation in addition to the orientation depicted inthe figures. The device may be otherwise oriented (rotated 90 degrees orat other orientations), and the spatially relative description usedherein may likewise be interpreted accordingly.

Generally, the circuit board assembly of the present disclosure can beused in any electronic product or electronic device, and can form ahighly integrated circuit board with various components such as radiofrequency, digital, optoelectronics, etc. using system in a package, andcan avoid electromagnetic wave leakage or interference between thevarious components.

First, please refer to FIG. 1A. FIG. 1A is a schematic cross-sectionalview of a circuit board assembly according to some embodiments of thepresent disclosure. In some embodiments of the present disclosure, thecircuit board assembly 100 includes a core layer 110, at least oneelectronic component 112, at least one first shielding ring wall 113, atleast one second shielding ring wall 114, a first circuit layer 120, asecond circuit layer 130, a first insulating layer 140, and a pluralityof shielding columns 141. The core layer 110 has at least oneaccommodating space 111, in which the accommodating space 111 has aninner sidewall. Please note that the inner sidewall is not speciallymarked in order to avoid too much confusion in the figure. Theelectronic component 112 is disposed in the accommodating space 111. Thefirst shielding ring wall 113 is disposed in the accommodating space 111and covers the inner sidewall, in which the first shielding ring wall113 surrounds the electronic component 112, and the first shielding ringwall 113 is not in contact with the electronic component 112. The secondshielding ring wall 114 is disposed in the core layer 110 and surroundsthe first shielding ring wall 113. In one embodiment, a material of thecore layer 110 is a photosensitive dielectric material. In someembodiments, a material of the core layer 110 includes, but is notlimited to, a photosensitive dielectric material such as photosensitivepolyimide (PSPI), photoimageable coverlay (PIC), or a combinationthereof. Specifically, the first shielding ring wall 113 is not incontact with the electronic component 112 means that there is an annularspace between the first shielding ring wall 113 and the electroniccomponent 112 to electrically separate the first shielding ring wall 113and the electronic component 112. In addition, the use of thephotosensitive dielectric material can support components havingdifferent sizes and form a corresponding chamber or an accommodatingspace. In the case of a given size space, more components may be stackedin a vertical direction, and thus the integration could be higher.

The core layer 110 may have more than one electronic component 112, andwhen there are a plurality of electronic components 112, each of theelectronic components 112 is surrounded by a corresponding firstshielding ring wall 113. It should be noted that FIG. 1A shows oneelectronic component 112 and one first shielding ring wall 113, whichare only exemplary, and it is not limited thereto. Specifically, thefirst shielding ring wall 113 preliminarily shields or blockselectromagnetic waves leaking from the electronic component 112 toremove most of the electromagnetic wave interference. In one embodiment,the electronic component 112 may include, but is not limited to, anactive component, a passive component, a high-frequency component, adigital component, an optoelectronic component, or a combinationthereof. In one embodiment, a material of the first shielding ring wall113 includes, but is not limited to, a conductive metal such as copper,gold, silver, nickel, a conductive alloy, or a combination thereof.

Please refer to FIG. 1B first. FIG. 1B is a schematic top view of a corelayer, an electronic component, a first shielding ring wall, a secondshielding ring wall, and a shielding column according to FIG. 1A. Insome embodiments, the second shielding ring wall 114 is disposed in thecore layer 110 and surrounds the first shielding ring wall 113. Therelationship between the first shielding ring wall 113 and the secondshielding ring wall 114 can be clearly seen from FIG. 1B. Specifically,the second shielding ring wall 114 is not directly in contact with thefirst shielding ring wall 113, and the second shielding ring wall 114and the first shielding ring wall 113 are substantially concentricallydisposed.

Please continue to refer to FIG. 1A. In some embodiments, the secondshielding ring wall 114 includes two metal layers 1141 and a conductivematerial 1142. The two metal layers 1141 are arranged in concentricrings, and one of the metal layers 1141 surrounds the other of the metallayers 1141 and the conductive material 1142. Specifically, two ends ofthe second shielding ring wall 114 extend to upper and lower surfaces ofthe core layer 110. The second shielding ring wall 114 can shield orblock electromagnetic waves leaking due to a gap difference between thecomponents when there is a size difference between the electroniccomponents 112. Specifically, the gap differences are caused by theportions of vertical embedded components on which copper is notdeposited or plated. Moreover, for a circuit board, the numbers andtypes of the embedded components in each position are different, and thegap differences are also different, but each of the gap differences isless than the overall thickness of the circuit board. As such, with thearrangement of the first shielding ring wall 113, most of theelectromagnetic waves leaking from the top, bottom, left, and right ofthe electronic component 112 are almost shielded. In addition, the metallayers 1141 in the second shielding ring wall 114 can increase rigidityof the circuit board assembly 100. In one embodiment, a material of thetwo metal layers 1141 of the second shielding ring wall 114 includes,but is not limited to, a conductive metal such as copper, gold, silver,nickel, a conductive alloy, or a combination thereof. In one embodiment,a conductive material 1142 of the second shielding ring wall 114includes, but is not limited to, copper, gold, silver, nickel, or ametal alloy of a combination thereof.

Please continue to refer to FIG. 1A, the core layer 110 is disposedbetween the first circuit layer 120 and the second circuit layer 130.Specifically, the electronic component 112 in the core layer 110 shouldbe electrically connected to outside. Therefore, the first circuit layer120 and the second circuit layer 130 are disposed on the upper and lowersurfaces of the core layer 110, and thus the electronic component 112can be electrically connected to the outside. In addition, the secondcircuit layer 130 is disposed between the first insulating layer 140 andthe core layer 110. The shielding column 141 is provided in the firstinsulating layer 140. In addition, a plurality of conductive columns 142are also disposed in the first insulating layer 140, and the conductivecolumns 142 are electrically connected to the electronic component 112.In one embodiment, the shielding column 141 is electrically connected tothe first shielding ring wall 113 and extends to upper and lowersurfaces of the first insulating layer 140. Furthermore, the shieldingcolumns 141 surround the conductive columns 142.

Referring to FIG. 1B at the same time, the shielding columns 141 arearranged along the first shielding ring wall 113. As such, when theconductive columns 142 beneath the electronic component 112 aslead-through portions have current flowing and generate anelectromagnetic field, the shielding column 141 can shield theelectromagnetic field generated by the current. However, it should benoted that FIG. 1B shows eight shielding columns 141, which are onlyexemplary, and it is not limited thereto. More or less shielding columns141 should be included in the scope of the present disclosure. At thesame time, the shielding column 141 is disposed in a column shape, whichis different from the first shielding ring wall 113 and the secondshielding ring wall 114, so that the conductive column 142 can furthercirculate with an external circuit. In some embodiments, a material ofthe shielding columns 141 and a material of the conductive columns 142include, but are not limited to, a conductive metal such as copper,gold, silver, nickel, a conductive alloy, or a combination thereof.

In some embodiments, the electronic component 112 is electricallyisolated from the first shielding ring wall 113, the second shieldingring wall 114, and the shielding column 141. As such, the firstshielding ring wall 113, the second shielding ring wall 114, and theshielding column 141 will not affect the electrical flow or functionbetween the electronic component 112 and the external circuit.

In some embodiments, the circuit board assembly 100 further includes ashielding layer 150, in which the shielding layer 150 is disposedbeneath the first insulating layer 140, and the first insulating layer140 is disposed between the shielding layer 150 and the core layer 110,and the shielding column 141 extends to the core layer 110 and theshielding layer 150. Specifically, the shielding layer 150 is disposedon a surface of the first insulating layer 140 opposite to the corelayer 110, and the shielding layer 150 is perpendicular to a center lineof the conductive column 142, which can enhance the shieldingperformance of the electromagnetic field. In one embodiment, theshielding layer 150 may not be provided, and a thick copper layer may beused instead, so that heat dissipation efficiency of the circuit boardassembly 100 can be increased. In one embodiment, metal wiring may alsobe used to replace the shielding layer 150, so that the electroniccomponent 112 can be further electrically connected with more electronicdevices.

In addition, in one embodiment, the first insulating layer 140 may alsohave a multi-layer structure, and the layers are connected by a build-upcircuit layer 143 and the conductive column 142.

Still referring to FIG. 1A, a surface of the electronic component 112,one end of the second shielding ring wall 114, and a surface of the corelayer 110 are coplanar. Specifically, the second shielding ring wall 114extends to the upper and lower surfaces of the core layer 110, so thatthe electromagnetic waves leaking from the electronic component 112 dueto the gap difference can be completely shielded.

In one embodiment, the circuit board assembly 100 further includes asecond insulating layer 160, a wiring layer 170, and a plurality ofconductive columns 161, and the first circuit layer 120 is disposedbetween the second insulating layer 160 and the core layer 110. Thewiring layer 170 is disposed on the second insulating layer 160, and theconductive column 161 extends to the core layer 110 and the wiring layer170.

It should be noted that a manufacturing method and a process flow of thecircuit board assembly 100 as shown in FIG. 1A will be detailed insubsequent paragraphs.

Please refer to FIG. 3A. FIG. 3A is a schematic cross-sectional view ofa circuit board assembly according to other embodiments of the presentdisclosure. As shown in FIG. 3A, the biggest difference between thisembodiment and the circuit board assembly 100 of FIG. 1A is that a corelayer 310 of a circuit board assembly 300 of this embodiment furtherincludes a graphene layer 315. It should be particularly noted that anoverall structure of the circuit board assembly 300 in FIG. 3A issimilar to that of the circuit board assembly 100 in FIG. 1A. Thecircuit board assembly 300 includes the core layer 310, at least oneelectronic component 312, and at least one first shielding ring wall313, at least one second shielding ring wall 314, a first circuit layer320, a second circuit layer 330, a first insulating layer 340, and aplurality of shielding columns 341. The core layer 310 has at least oneaccommodating space 311, in which the accommodating space 311 has aninner sidewall. The electronic component 312 is disposed in theaccommodating space 311. The first shielding ring wall 313 is disposedin the accommodating space 311 and covers the inner sidewall, in whichthe first shielding ring wall 313 surrounds the electronic component312, and the first shielding ring wall 313 is not in contact with theelectronic component 312. The second shielding ring wall 314 is disposedin the core layer 310 and surrounds the first shielding ring wall 313.The second shielding ring wall 314 includes two metal layers 3141 and aconductive material 3142. The two metal layers 3141 are arranged inconcentric rings, and one of the metal layers 3141 surrounds the otherof the metal layers 3141 and the conductive material 3142. The corelayer 310 is disposed between the first circuit layer 320 and the secondcircuit layer 330. The second circuit layer 330 is disposed between thefirst insulating layer 340 and the core layer 310. The shielding column341 is disposed in the first insulating layer 340. In addition, aplurality of conductive columns 342 are also disposed in the firstinsulating layer 340, and the conductive columns 342 are electricallyconnected to the electronic component 312. The shielding columns 341 arearranged along the first shielding ring wall 313. The circuit boardassembly 300 further includes a shielding layer 350, in which theshielding layer 350 is disposed beneath the first insulating layer 340,and the first insulating layer 340 is disposed between the shieldinglayer 350 and the core layer 310, and the shielding column 341 extendsto the core layer 310 and shielding layer 350. The circuit boardassembly 300 further includes a second insulating layer 360, a wiringlayer 370 and a plurality of conductive columns 361, and the firstcircuit layer 320 is disposed between the second insulating layer 360and the core layer 310. The wiring layer 370 is disposed on the secondinsulating layer 360, and the conductive columns 361 extend to the corelayer 310 and the wiring layer 370.

Materials of all the components in the circuit board assembly 300described above are the same as those of the circuit board assembly 100in FIG. 1A, and will not be repeated here.

In some embodiments, the graphene layer 315 is disposed in theaccommodating space 311 and surrounds the electronic component 312, andthe graphene layer 315 is continuously distributed around the electroniccomponent 312. Specifically, the graphene layer 315 is disposed betweenthe electronic element 312 and the first shielding ring wall 313,between the electronic element 312 and the first circuit layer 320, andbetween the second circuit layer 330 and the first insulating layer 340,and the graphene layer 315 is a continuous structure. When the graphenelayer 315 is disposed in the accommodating space 311, the graphene layer315 can improve heat dissipation efficiency of the circuit boardassembly 300.

Please refer to FIG. 3B first. FIG. 3B is a schematic top view of thecore layer, the electronic component, the first shielding ring wall, thesecond shielding ring wall, the shielding column, and the graphene layeraccording to FIG. 3A. It can be clearly understood from FIG. 3B that thegraphene layer 315 is disposed between the first shielding ring wall 313and the electronic component 312 and covers the electronic component312, so that the heat dissipation efficiency of the electronic component312 can be improved.

It should be noted that a manufacturing method and a process flow of thecircuit board assembly 300 as shown in FIG. 3A will be detailed insubsequent paragraphs.

Please refer to FIG. 5A. FIG. 5A is a schematic cross-sectional view ofa circuit board assembly according to still other embodiments of thepresent disclosure. Specifically, FIG. 5A shows a circuit board assembly500 having a plurality of electronic components 512.

The circuit board assembly 500, a core layer 510, the electroniccomponents 512, a first shielding ring wall 513, a second shielding ringwall 514, a metal layer 5141, a conductive material 5142, a firstcircuit layer 520, a second circuit layer 530, a first insulating layer540, a shielding column 541, a conductive column 542, a build-up circuitlayer 543, a shielding layer 550 (or a thick copper layer, a metalwiring), a second insulating layer 560, a conductive column 561 and awiring layer 570 shown in FIG. 5A, a structural feature and a materialof each of the components are the same as the circuit board assemblies100 and 300 shown in FIG. 1A and FIG. 3A, so these components will notbe repeated here.

Specifically, FIG. 5A shows three electronic components 512. Differentelectronic components 512 in the vertical direction are separated by aphotosensitive dielectric material. Therefore, there will be a gapdifference between the electronic components 512, and electromagneticwaves will leak out. Accordingly, the second shielding ring wall 514 canshield and block the electromagnetic waves leaking out, and prevent theelectronic components 512 from interfering with each other.

Please refer to FIG. 5B. FIG. 5B is a schematic top view of the corelayer, the electronic component, the first shielding ring wall, thesecond shielding ring wall, and the shielding column according to FIG.5A. It can also be found from FIG. 5B that the first shielding ring wall513 is not in contact with the electronic component 512, so that theelectrical isolation between the first shielding ring wall 513 and theelectronic component 512 is maintained.

It should be noted that a manufacturing method and a process flow of thecircuit board assembly 500 as shown in FIG. 5A will be detailed insubsequent paragraphs.

Please refer to FIG. 7 . FIG. 7 is a schematic cross-sectional view of acircuit board assembly according to still other embodiments of thepresent disclosure. A circuit board assembly 700, a core layer 710, anelectronic component 712, a first shielding ring wall 713, a secondshielding ring wall 714, a metal layer 7141, a conductive material 7142,a first circuit layer 720, a second circuit layer 730, a firstinsulating layer 740, a shielding column 741, a conductive column 742, abuild-up circuit layer 743, a shielding layer 750 (or a thick copperlayer, a metal wiring), a second insulating layer 760, a conductivecolumn 761 and a wiring layer 770 shown in FIG. 7 , a structural featureand a material of each of the components are the same as the circuitboard assemblies 100 and 300 shown in FIG. 1A and FIG. 3A, so thesecomponents will not be repeated here.

Specifically, FIG. 7 shows two electronic components 712, and an uppersurface of one of the electronic components 712 is not in contact withan upper surface of the core layer 710. In one embodiment, the height ofthe second shielding ring wall 714 is greater than the thickness of theelectronic component 712 which is not in contact with the upper surfaceof the core layer 710. Accordingly, the second shielding ring wall 714can prevent the electromagnetic waves leaking from the electroniccomponent 712 having the gap difference, and keep the electroniccomponents 712 from interfering with each other.

Hereinafter, the manufacturing method and the process flow of thecircuit board assembly 100 of the embodiment shown in FIG. 1A will bedescribed in detail.

Please refer to FIGS. 2A to 2J. FIGS. 2A to 2J are schematiccross-sectional views illustrating a method of manufacturing a circuitboard assembly at various process stages according to some embodimentsof the present disclosure. Firstly, as shown in FIG. 2A, a substrate 210is provided, and a first dielectric layer 220 and a first release film230, and a second dielectric layer 240 and a second release film 250 areformed on both sides (i.e., upper and lower surfaces) of the substrate210, respectively. The first release film 230 is disposed between thefirst dielectric layer 220 and the substrate 210, and the second releasefilm 250 is disposed between the second dielectric layer 240 and thesubstrate 210. Specifically, the first release film 230 and the secondrelease film 250 are provided to facilitate separation of the firstdielectric layer 220 and the second dielectric layer 240 in subsequentprocesses. In one embodiment, a material of the first dielectric layer220 and a material of the second dielectric layer 240 include, but arenot limited to, a photosensitive dielectric material such asphotosensitive polyimide (PSPI), photoimageable coverlay (PIC) or acombination thereof.

Referring to FIG. 2B, the first dielectric layer 220 and the seconddielectric layer 240 are patterned to form a first dielectric patternlayer 220′ and a second dielectric pattern layer 240′. The firstdielectric pattern layer 220′ has a first recess 221 and a first groove222, and the second dielectric pattern layer 240′ has a second recess241 and a second groove 242. Specifically, the first dielectric patternlayer 220′ and the second dielectric pattern layer 240′ are used asstructural package components. In one embodiment, a method of patterningthe first dielectric layer 220 and the second dielectric layer 240includes, but is not limited to, an exposure process and a developmentprocess.

As shown in FIG. 2C, a first metal layer 260 is formed on the firstdielectric pattern layer 220′, in which the first metal layer 260 coversan upper surface of the first dielectric pattern layer 220′, a sidewallof the first recess 221 and a sidewall of the first groove 222. Inaddition, a second metal layer 270 is formed on the second dielectricpattern layer 240′, in which the second metal layer 270 covers an uppersurface of the second dielectric pattern layer 240′, a sidewall of thesecond recess 241 and a sidewall of the second groove 242. In oneembodiment, a method of forming the first metal layer 260 and the secondmetal layer 270 includes, but is not limited to, a deposition process,an electroplating process, a coating process, or a combination thereof.In one embodiment, a material for forming the first metal layer 260 anda material for forming the second metal layer 270 include, but are notlimited to, a conductive metal such as copper, gold, silver, nickel, aconductive alloy, or a combination thereof.

Referring to FIG. 2D, the first metal layer 260, the second metal layer270, the first dielectric pattern layer 220′, and the second dielectricpattern layer 240′ are thinned to form a first dielectric pattern layer220″, a second dielectric pattern layer 240″, a first metal patternlayer 260′ and a second metal pattern layer 270′ exposing upper surfacesthereof. In one embodiment, a method of thinning the first metal layer260, the second metal layer 270, the first dielectric pattern layer220′, and the second dielectric pattern layer 240′ includes, but is notlimited to, an etching process, an exposure process and a developmentprocess.

As shown in FIG. 2E, an electronic component 112 is disposed in thefirst recess 221, and the electronic component 112 is located on thesubstrate 210. It should be noted that the electronic component 112 isnot in contact with the metal pattern layer 260′ on the sidewall of thefirst recess 221, and thus to prevent the electronic element 112 frombeing electrically connected to the first metal pattern layer 260′. Atthe same time, a plurality of conductive materials 1142 are filled inthe first groove 222 and the second groove 242. It should be noted thatthe conductive materials 1142 protrude from a surface of the firstdielectric pattern layer 220″ and a surface of the second dielectricpattern layer 240″. Accordingly, in a subsequent stacking process, thefirst dielectric pattern layer 220″ and the second dielectric patternlayer 240″ can be completely bonded.

Please refer to FIG. 2F, the second dielectric pattern layer 240″ isseparated from the substrate 210 by the second release film 250, and isfurther stacked on the first dielectric pattern layer 220″ and theelectronic element 112. As such, the first metal pattern layer 260′ andthe second metal pattern layer 270′ are bonded, and the conductivematerials 1142 are also bonded to each other, and thus forming a firstshielding ring wall 113 and a second shielding ring wall 114.Accordingly, the core layer 110 shown in FIG. 1A is formed. When thesecond dielectric pattern layer 240″ is stacked on the first dielectricpattern layer 220″ and the electronic element 112, the first dielectricpattern layer 220″ and the second dielectric pattern layer 240″ areadhered to each other. Next, a second circuit layer 130 is formed on thecore layer 110. Specifically, the second circuit layer 130 is formed byelectroplating or metal deposition and then etching.

In one embodiment, during the process of adhering the first dielectricpattern layer 220″ and the second dielectric pattern layer 240″ to eachother, a temperature of a working environment is in a range from 25° C.to 180° C., and thus can prevent the core layer 110 from expanding anddeforming due to heating or overheating, which leads to damage.

Please refer to FIG. 2G, a first insulating layer 140 is fabricated, anda shielding layer 150 is formed on a surface thereof (a thick copperlayer or a metal wiring can also be formed), and a build-up circuitlayer 143 is formed in the first insulating layer 140. In oneembodiment, a method of forming the shielding layer 150 (or the thickcopper layer, the metal wiring) includes, but is not limited to, adeposition process, an electroplating process, a coating process, or acombination thereof.

As shown in FIG. 2H, a plurality of shielding columns 141 and aplurality of conductive columns 142 are formed in the first insulatinglayer 140, and the shielding columns 141 extend to upper and lowersurfaces of the first insulating layer 140, and the conductive columns142 are surrounded by the shielding columns 141. In one embodiment, amethod of forming the shielding columns 141 and the conductive columns142 includes, but is not limited to, a drilling process and a depositionprocess.

Referring to FIG. 2I, the first insulating layer 140 shown in FIG. 2H isstacked on the core layer 110. It should be noted that this step is toadhere a surface of the first insulating layer 140 that the shieldinglayer 150 is not disposed and the core layer 110 to each other. As such,the shielding columns 141 are electrically connected to the firstshielding ring wall 113, and the conductive columns 142 are electricallyconnected to the electronic component 112.

Then referring to FIG. 2J, the core layer 110 is separated from thesubstrate 210 by the first release film 230, and a first circuit layer120 is formed on a surface of the core layer 110 that is not adhered tothe first insulating layer 140. Specifically, the first circuit layer120 is formed by electroplating or metal deposition and then etching.Next, a second insulating layer 160 is formed on the first circuit layer120, and a plurality of conductive columns 161 are formed in the secondinsulating layer 160, and a wiring layer 170 is then formed on thesecond insulating layer 160. Specifically, the first circuit layer 120is disposed between the second insulating layer 160 and the core layer110, and the second insulating layer 160 is disposed between the wiringlayer 170 and the first circuit layer 120.

So far, the circuit board assembly 100 as shown in FIG. 1A is formed,which has the effect of shielding the electromagnetic waves leaking fromthe electronic component 112 in all directions.

Next, the manufacturing method and the process flow of the circuit boardassembly 300 of the embodiment shown in FIG. 3A will be described indetail below.

First of all, it should be noted that in order to provide the graphenelayer 315 on the core layer 310 in the circuit board assembly 300, theelectronic component 112 is not disposed during the step of filling theconductive materials 1142 shown in FIG. 2E, but the second dielectricpattern layer 240″ is firstly stacked on the first dielectric patternlayer 220″, and the conductive materials 1142 are bonded.

Referring to FIG. 4A, a first shielding ring wall 313 is formed on aninner sidewall of an accommodating space 311, and a second circuit layer330 is formed on a core layer 310. The method of forming the firstshielding ring wall 313 and the second circuit layer 330 includes, butis not limited to, a deposition process, an electroplating process, acoating process, or a combination thereof.

Next, as shown in FIG. 4B, the graphene layer 315 is formed on asubstrate 410, an inner side of the first shielding ring wall 313, andthe second circuit layer 330. The graphene layer 315 is continuous andintegrally formed. In one embodiment, the graphene layer 315 is embeddedin the core layer 310 and on the second circuit layer 330.

Referring again to FIG. 4C, the electronic component 312 is disposed inthe graphene layer 315. Specifically, the graphene layer 315 covers theelectronic component 312 and electrically separates the electroniccomponent 312 and the first shielding ring wall 313.

Next, as shown in FIG. 4D, after the graphene layer 315 is formed andthe electronic component 312 is disposed, subsequent steps are the sameas those in FIG. 2G to FIG. 2J, and a first insulating layer 340, ashielding column 341, a conductive column 342, a build-up circuit layer343, a shielding layer 350, a first circuit layer 320, a secondinsulating layer 360, a conductive column 361 and a wiring layer 370 areformed. As such, the circuit board assembly 300 as shown in FIG. 3A isformed, which has the effect of shielding the electromagnetic wavesleaking from the electronic component 312 in all directions, and has theeffect of enhancing the heat dissipation efficiency.

Hereinafter, the manufacturing method and the process flow of thecircuit board assembly 500 of the embodiment shown in FIG. 5A will bedescribed in detail.

Please refer to FIGS. 6A to 6C. FIGS. 6A to 6C are schematiccross-sectional views illustrating a method of manufacturing a circuitboard assembly at various process stages according to still otherembodiments of the present disclosure. The difference between thisembodiment and the previously described embodiment is that a pluralityof electronic components 512 are provided in this embodiment.

First, as shown in FIG. 6A, a first dielectric pattern layer 630 and afirst release film 620 a are formed on one side of a first substrate610, and a second dielectric pattern layer 640 and a second release film620 b are formed on another side thereof, in which the first releasefilm 620 a is disposed between the first dielectric pattern layer 630and the first substrate 610, and the second release film 620 b isdisposed between the second dielectric pattern layer 640 and the firstsubstrate 610. A third dielectric pattern layer 650 and a third releasefilm 620 c are formed on one side of a second substrate 610′, and afourth dielectric pattern layer 660 and a fourth release film 620 d areformed on another side thereof, in which the third release film 620 c isdisposed between the third dielectric pattern layer 650 and the secondsubstrate 610′, and the fourth release film 620 d is disposed betweenthe fourth dielectric pattern layer 660 and the second substrate 610′.In addition, the electronic components 512 are disposed in a pluralityof recesses of the third dielectric pattern layer 650.

Next, as shown in FIG. 6B, the first dielectric pattern layer 630 andthe second dielectric pattern layer 640 are peeled off sequentially bythe first release film 620 a and the second release film 620 b, and thefirst dielectric pattern layer 630 and the second dielectric patternlayer 640 are sequentially stacked on the third dielectric pattern layer650 and the electronic elements 512. The first dielectric pattern layer630, the second dielectric pattern layer 640, and the third dielectricpattern layer 650 are adhered to each other. In addition, anotherelectronic element 512 is further disposed on the stacked firstdielectric pattern layer 630 and in the second dielectric pattern layer640. When upper surfaces of the electronic components 512 cannot becoplanar with an upper surface of the second dielectric pattern layer640, the fourth dielectric pattern layer 660 can be further adjusted tomake an upper surface of the core layer 510 be flat.

As shown in FIG. 6C, subsequent steps are the same as those in FIGS. 2Gto 2J. Accordingly, the first insulating layer 540, the shielding column541, the conductive column 542, the build-up circuit layer 543, theshielding layer 550, the first circuit layer 520, the second insulatinglayer 560, the conductive column 561 and the wiring layer 570 areformed. As such, the circuit board assembly 500 as shown in FIG. 5A isformed, which has the effect of shielding the electromagnetic wavesleaking from the electronic components 512 in all directions.

In summary, the circuit board assembly of the present disclosure isprovided with the first shielding ring wall around each of theelectronic components, which preliminarily shields the electromagneticwaves. Next, the second shielding ring wall is used to shield theelectromagnetic waves leaking from the electronic components due to thedifference in size. The first shielding column and/or the secondshielding column are further used to shield the electromagnetic fieldgenerated by the conductive columns. Next, the shielding layer isdisposed to enhance the overall shielding effect. In addition, thepresent disclosure can also provide the graphene layer to increase theheat dissipation effect of the circuit board assembly. Accordingly, thepresent disclosure can effectively avoid the electromagneticinterference between the electronic components.

The foregoing outlines features of several embodiments so that thoseskilled in the art may better understand various aspects of the presentdisclosure. Those skilled in the art should appreciate that they mayreadily use the present disclosure as a basis for designing or modifyingother processes and structures for carrying out the same purposes and/orachieving the same advantages of the embodiments introduced herein.Those skilled in the art should also realize that such equivalentconstructions do not depart from the spirit and scope of the presentdisclosure, and that they may make various changes, substitutions, andalterations herein without departing from the spirit and scope of thepresent disclosure. The scope of protection of the present disclosureshall be subject to the scope of appended claims.

What is claimed is:
 1. A circuit board assembly, comprising: a corelayer having at least one accommodating space, wherein the at least oneaccommodating space has an inner sidewall; at least one electroniccomponent disposed in the at least one accommodating space; at least onefirst shielding ring wall disposed in the at least one accommodatingspace and covering the inner sidewall, wherein the at least one firstshielding ring wall surrounds the at least one electronic component andis not contact with the at least one electronic component; at least onesecond shielding ring wall disposed in the core layer and surroundingthe at least one first shielding ring wall; a first circuit layer; asecond circuit layer, wherein the core layer is disposed between thefirst circuit layer and the second circuit layer; a first insulatinglayer, wherein the second circuit layer is disposed between the firstinsulating layer and the core layer; and a plurality of shieldingcolumns disposed in the first insulating layer.
 2. The circuit boardassembly of claim 1, wherein the shielding columns are electricallyconnected to the at least one first shielding ring wall.
 3. The circuitboard assembly of claim 1, further comprising a shielding layer, whereinthe shielding layer is disposed beneath the first insulating layer, andthe first insulating layer is disposed between the shielding layer andthe core layer, and the shielding columns extend to the core layer andthe shielding layer.
 4. The circuit board assembly of claim 1, whereinthe at least one second shielding ring wall comprises two metal layersand a conductive material, and the two metal layers are arranged inconcentric rings, and one of the metal layers surrounds the other of themetal layers and the conductive material.
 5. The circuit board assemblyof claim 4, wherein a surface of the at least one electronic component,one end of the conductive material, and a surface of the core layer arecoplanar.
 6. The circuit board assembly of claim 4, wherein a height ofthe second shielding ring wall is greater than a thickness of the atleast one electronic component.
 7. The circuit board assembly of claim1, further comprising a second insulating layer, wherein the firstcircuit layer is disposed between the second insulating layer and thecore layer.
 8. The circuit board assembly of claim 7, wherein a materialof the core layer is a photosensitive dielectric material.
 9. Thecircuit board assembly of claim 7, further comprising a graphene layer,wherein the graphene layer is disposed in the at least one accommodatingspace and surrounds the at least one electronic component, and thegraphene layer is continuously distributed around the at least oneelectronic component.
 10. The circuit board assembly of claim 1, whereinthe at least one electronic component is electrically isolated from theat least one first shielding ring wall, the at least one secondshielding ring wall, and the shielding columns.